Specifications; Telescope Specifications; Threads Specifications - SKY-WATCHER SL131119 Instruction Manual

Telescope specifications

Optical Design
Field Flattener
Aperture (mm)
Focal Length
Focal Ratio
Finderscope
Diagonal
Tube Rings
Highest Useful Magnification
Lowest Useful Magnification
Limiting Stellar Magnitude
Resolution (Rayleigh)
Resolution (Dawes)
Light Gathering Power (Compared to Human Eye)
Optical Coatings
Fully Illuminated Field With Field Flattener
Optical Tube Length (Retracted Dew Cap)
Optical Tube Weight
Telescope Visual Backfocus
Field Flattener Backfocus

Threads specifications

Rings/
Threads
Ø
In
In screw depth
Ø
Out
Out screw depth
∗
The visual back focus of the telescope is the distance from the end of the focuser tube (with 2'' adapter
installed) to the focal plane. This means, all accessories needing 170mm back focus or less can be installed.
**
The back focus of the field flattener is the distance from the back of the field flattener (flat surface at the exit)
to the focal plane. To obtain flat wide field images, the sensor should be positioned at exactly (+-1mm) this
distance. See also detailed explanations on bottom of page 8.

Specifications

∗
**
Focuser Drawtube
Tube Adatpor
n/a M74x1 F.
n/a 7 mm
M74 x1 M M65x1 M.
6 mm 6 mm
Refractor (air-spaced triplet APO)
Thread-on (2 lenses)
150 mm (5.9 in)
1050 mm (41 in)
7
9x50, erect-image, right-angle
2" dielectric coatings
With 3" (D Style) dovetail plate
354 x
21 x
13.4
0.93 arc seconds
0.77 arc seconds
459 x
Fully multi-coated
44 mm (1.7 in)
92 cm (36 in)
15 kg (32 lbs)
>170mm (6.7 in)
96mm (3.8 in)
Field
Flattener
M65x1 F.
7.5 mm
M62x1 M.
6 mm
11
DSLRl Enlarged
Ext. Tube T-Ring
M62x1 F. M48x0.75 F.
8.5 mm variable
M48x0.75 M Camera
6 mm n/a